STM32L031C6 datasheet(28/126 Pages) STMICROELECTRONICS

28 / 126 page

Functional overview

STM32L031x4/6

28/126

DS10668 Rev 6

3.12.1

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC and Comparators. VREFINT is internally connected to the ADC_IN17 input channel. It

enables accurate monitoring of the VDD value (since no external voltage, VREF+, is available

for ADC). The precise voltage of VREFINT is individually measured for each part by ST during

production test and stored in the system memory area. It is accessible in read-only mode.

3.13

Ultra-low-power comparators and reference voltage

The STM32L031x4/6 embed two comparators sharing the same current bias and reference

voltage. The reference voltage can be internal or external (coming from an I/O).

•

One comparator with ultra low consumption

•

One comparator with rail-to-rail inputs, fast or slow mode.

•

The threshold can be one of the following:

–

External I/O pins

–

Internal reference voltage (VREFINT)

–

submultiple of Internal reference voltage(1/4, 1/2, 3/4) for the rail to rail

comparator.

Both comparators can wake up the devices from Stop mode, and be combined into a

window comparator.

The internal reference voltage is available externally via a low-power / low-current output

buffer (driving current capability of 1 µA typical).

3.14

System configuration controller

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports.

The highly flexible routing interface allows the application firmware to control the routing of

different I/Os to the TIM2, TIM21, TIM22 and LPTIM timer input captures. It also controls the

routing of internal analog signals to the ADC, COMP1 and COMP2 and the internal

reference voltage VREFINT.

Table 8. Internal voltage reference measured values

Calibration value name

Description

Memory address

VREFINT_CAL

Raw data acquired at

temperature of 25 °C

VDDA = 3 V

0x1FF8 0078 - 0x1FF8 0079

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